Optical pick-up head unit

An optical pick-up and optical element technology, applied in optical recording heads, beam guiding devices, optics, etc., can solve problems such as difficult mass production of optical pick-up heads and complex manufacturing processes

Inactive Publication Date: 2002-05-01
TOSHIBA SAMSUNG STORAGE TECH KOREA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, not only does this complicate the manufacturing process, but also the adjustment of the film thickness must be performed precisely in units of "μm"
Thereby it is difficult to mass-produce this optical pick-up head

Method used

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  • Optical pick-up head unit
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  • Optical pick-up head unit

Examples

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Embodiment Construction

[0023] Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

[0024] image 3 An optical system of an optical pickup according to a preferred embodiment of the present invention is shown. refer to image 3 , this optical pick-up head device comprises two laser sources 31 and 39, sends out the light beam with different wavelength respectively; Two holographic beam splitters 32 and 40, are used for changing the light path of the light beam reflected by the information recording surface of optical disc; Beam splitting Device 33, according to the wavelength of the light, all transmits or reflects the incident light beam; collimator lens 34, can make the incident light beam become parallel light beam; holographic annular lens 35, is used to diffract the incident light beam according to its wavelength; and objective lens 36, with To focus the light beams on the corresponding information recording surfaces ...

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Abstract

An optical pickup apparatus compatible with at least two types of optical recording media, using light beams having specifically wavelengths for recording and reading information, wherein, a side of the objective lens has a plurality of ring-shape grooves with stated depth to reduce the beam spot spherical aberration of the objective lens focusing on the optical recording media recording surface. The optical pickup apparatus eliminates the spherical aberration generated when an optical recording medium having a different thickness.

Description

[0001] This application is a divisional application of the invention patent application filed by Samsung Electronics Co., Ltd. on March 28, 1998, entitled "Optical Head Using Holographic Ring Lens Compatible with Multi-purpose Optical Disc and Recordable Mini-Disc", with application number 98108006.5. technical field [0002] The present invention relates to an optical pick-up device compatible with a digital video disc (DVD) and a recordable compact disc (hereinafter referred to as CD-R), in particular to a holographic lens capable of recording information to a digital video disc (DVD) in a compatible manner. and recordable compact disc (CD-R), and read information from it. Background technique [0003] The optical pickup device is used to record and read high-density information such as video, audio or data, and its record carrier is a disk, card or cassette. Among them, a disk-type record carrier is mainly used. Recently, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/08G02B5/32G11B7/00G11B7/125G11B7/1275G11B7/135G11B7/1353G11B7/1372G11B7/20
CPCG02B5/32G11B7/1353G11B7/1372G11B2007/0006G11B7/1275G11B7/08
Inventor 刘长勋李哲雨
Owner TOSHIBA SAMSUNG STORAGE TECH KOREA CORP
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